Within the last week Bob has started meowing a lot, and he's also been doing other strange things like hiding under and behind the couch. Nothing has changed in the past 6 months since Bickford joined the family. Despite my best efforts at night he's more obnoxious (knocking things over, stealing my glasses if he can find them, making a lot of noise in the living room) than before. He had his annual checkup a couple of months ago and everything came back fine, including bloodwork. He's eating, drinking and using the litterbox just fine. Anyone have any suggestions on what's going on?